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Standard XII
Biology
Type I
The graph sho...
Question

The graph shows the body size distribution in a population. The effect of stabilizing selection on the distribution can be described by the statement that
497737.jpg

A
The mean shifts and the curve remains the same
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B
The mean shifts and the curve becomes narrower
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C
The mean remains the same and the curve becomes wider
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D
The mean remains the same and the curve becomes narrower
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E
The mean shifts to both the left and the right and two new curves form
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Solution

The correct option is A The mean shifts and the curve remains the same
Stabilizing selection is a type of natural selection where the genetic diversity is decreasing that favor the average individuals in a population. This process selects against the extreme phenotypes and instead favors the majority of the population that is well adapted to the environment. Stabilizing selection is often shown on a graph as a modified bell curve that is narrower and taller than the norm. Thus, the correct answer is option A.

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Q.

In the graph showing Maxwell, Boltzmann distribution of energy ........ .
(a) area under the curve must not change with an increase in temperature
(b) area under the curve increases with increase in temperature
(c) area under the curve decreases with increase in temperature
(d) with an increase in temperature, curve broadens and shifts to the right-hand side

Q. State whether the following statement are TRUE and FALSE

1. Demand curve slopes upward from left to right.

2. Desire means demand.

3. When demand increases, the demand curve shifts to the left.

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Select the correct statements regarding the characteristics of the curves

Q.
The gas molecules randomly move in all directions and collide with each other and with the wall of the container. It is difficult to determine the speed of an individual molecule but it has become possible to work out the distribution of molecules among different molecular speeds. This is known as Maxwell Boltzmann distribution.
Consider the following graph about Maxwell's distribution of speeds at two different temperatures T1 and T2.
The curve has which of the following characteristics?
(i) It has symmetrical distribution of molecules against molecular velocity.
(ii) The area under the curve gives the total number of molecules.
(iii) The maxima of the curve shifts towards right as the temperature is raised.
(iv) The area under the curve is independent of temperature.
Select the correct statements from the codes given below.
653966_0e1010dabee9430d8dc0e44affe935bb.png
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